var x = "";
var e = null;

function cntchar(m) {
    if(window.document.forms[0].text.value.length > m) {
        window.document.forms[0].text.value = x;
    } else {
        x = window.document.forms[0].text.value;
    }
    if(e == null)
    e = document.getElementById('cntChars');
    else
    e.childNodes[0].data = window.document.forms[0].text.value.length;
}